Product Introduction of Anti-islanding Protection Relay
The GWZC-9890D Anti-islanding Protection Relay is a specialized device engineered to prevent unintentional islanding in distributed generation systems (e.g., solar farms, wind turbines, and cogeneration plants). Its core function is to detect grid failure using active/passive monitoring techniques (measuring voltage, frequency, rate-of-change of frequency, and phase displacement) and rapidly disconnect generators within milliseconds upon detecting an islanding condition.
The GWZC-9890D Anti-islanding Protection Relay ensures safety for utility personnel, prevents equipment damage, and maintains grid stability. Additionally, it supervises grid re-synchronization to block reconnection until voltage, frequency, and phase alignment are stable. Typically installed at the Point of Common Coupling (PCC) in generator switchgear or substation protection panels (for voltages ≤ 33kV/35kV), it serves as a critical safety device for compliant grid integration of distributed energy resources.
Product functionsANSI）：
1.Overfrequency Protection (ANSI 81O)
2.Underfrequency Protection (ANSI 81U)
3.Overvoltage Protection (ANSI 59)
4.Undervoltage Protection (ANSI 27)
5.Rate of Change of Frequency Protection (ANSI 81R)
6.Reverse Power Protection (ANSI 32)
7.External Trip (ANSI 94)
8.Directional Overcurrent Protection (ANSI 67)
9.Residual Overcurrent Protection (ANSI 50N/51N)
10.Residual Overvoltage Protection (ANSI 59N)
11.Voltage Check Auto-Reclosing (ANSI 79)
12.Potential Transformer Fuse Failure (ANSI 60FL)
13.Harmonic Detection (ANSI 50H/51H)
Electrical Specifications
Power Supply:
● AC: 85-264V, 47-63Hz (≤15% THD)
● DC: 100-370V (≤5% ripple)
Rated AC Parameters:
● Voltage: 100V/√3 or 100V
● Current: 5A/1A
● Frequency: 50Hz
Overload Capacity:
● Current Circuit: 2×In continuous | 10×In (10s) | 40×In (1s)
● Voltage Circuit: 1.5×Un continuous
Power Consumption:
● Supply: <10W (static), ≤15W (trip)
● Current Circuit: ≤1VA/phase (5A) / ≤0.5VA/phase (1A)
● Voltage Circuit: ≤0.5VA/phase
Digital Output:
● Dry contact (8A@250VAC / 30VDC)
● Dielectric: 4kVAC (coil-contact), 1kVAC (open contact)
● Operating Time: 5ms (typ) / 8ms (max)
● Mechanical Life: 100k operations
Protection Performance
Operating Range:
● Voltage: 0.5-120V (phase)
● Current: 0.02-20×In
● Zero-Seq Current: 0.05-20A
● Frequency: 35-65Hz | Delay: 0-100s
Accuracy:
● Voltage/Current: ±2.5% or ±0.1V/±0.05A (whichever greater)
● Frequency: ±0.01Hz
● Settings: ±2.5%
Trip Time:
● Instantaneous: ≤35ms (≥1.2× setting)
● Time-Delayed: ≤1% of setting or 35ms
Measurement & Monitoring
Range:
● Voltage: 0.5-120V | Current: 0.02-1.2×In
Accuracy:
● V/I: ±0.2% | Frequency: ±0.01Hz | Other: 0.5%
● Time Sync: ≤2ms | SOE: ≤1ms
Event Recording:
● 128 protection trips/operations
● 32 self-tests/fault waveforms (COMTRADE)
Environmental & Mechanical
Operating Temp:
● Standard: -10°C to +55°C
● Extended: -40°C to +70°C*
Storage Temp: -40°C to +80°C
Humidity: 5-90% RH (non-condensing)
Pressure: 60-110 kPa
Compliance:
● IEC 60255-21 (vibration/shock)
● IEC 61000-6 (EMC)
